<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>方法</title>
</head>
<body>
<input type="button" value="按钮" onclick="fn()">

<script>
    function fn(){
        for (let i = 0; i < 10; i++) {
            alert(i);
        }
    }

  //1.无参无返回值
  function f1() {
    alert("f1")
  }
  //f1(); //调用
  //2.有参无返回值
  function f2(name,age){
    alert(name+":"+age);
  }
  //2("张飞",18);
  //3.无参有返回值
  function f3(){
    return "我是返回值";
  }
  let info = f3();
  //alert(info);
  //4.有参有返回值
  function f4(x,y){
    return x*y;
  }
  let result = f4(5,9);
  //alert(result);

  //5.第二种声名方法的格式
  let f5 = function (name,age){
      alert(name+":"+age);
  }
  // f5("张三",50);

  //6.第三种声名方法的格式
  let f6 = new Function("name","age","alert(name+':'+age)");
  // f6("赵云",70);

</script>
</body>
</html>